[Bug 242932] x11-toolkits/qt5-gui: QClipboard sometimes fails to paste the image

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242932

            Bug ID: 242932
           Summary: x11-toolkits/qt5-gui: QClipboard sometimes fails to
                    paste the image
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: yuri at freebsd.org
          Assignee: kde at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)

Created attachment 210273
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210273&action=edit
testcase.shar

QClipboard sometimes fails to paste the image that is present in the clipboard.

How to reproduce:
1. Compile the executable 'test' from the attached shar by running 'sh mk.sh'
2. In the Chromium browser go to
https://wooda.co/wp-content/uploads/2018/02/Log-Type-E-Designer-Wooden-Chair-1.png
It should display the picture of a wooden chair. With right mouse button open
the menu, and select the "Copy image" item
3. Run the executable 'test'
4. It will most likely fail like this:
> $ ./test 
> has image: mime= "TIMESTAMP, TARGETS, SAVE_TARGETS, MULTIPLE, image/png, text/html, application/x-qt-image"
> INVALID! height=0!

Qt says that the image in the clipboared is zero-sized. However, this X11
command pastes it without a problem:
> xclip -selection clipboard -t image/png -o > x.png

For a comparison, when I do the same in the Firefox browser Qt pastes the image
fine:
> $ ./test 
> has image: mime= "TIMESTAMP, TARGETS, MULTIPLE, SAVE_TARGETS, text/html, text/_moz_htmlinfo, text/_moz_htmlcontext, image/png, image/bmp, image/x-bmp, image/x-MS-bmp, image/x-icon, image/x-ico, image/x-win-bitmap, image/vnd.microsoft.icon, application/ico, image/ico, image/icon, text/ico, image/jpeg, image/tiff, application/x-qt-image"
> Valid: size= 427 x 600


Curiously, sometimes, every once in 15-20+ times, Qt is able to paste the image
even when Chromium copied it into the clipboard.

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